Why is a 470pF capacitor and a 6.8nH inductor recommended for the input matching circuit of the MAX2659, even though their resonant frequency is 0.09GHz, not 1.5742GHz?

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Accepted Answer

The recommendation for a 470pF capacitor and a 6.8nH inductor in series is primarily for DC blocking due to the DC bias inside the RF IN of the MAX2659, and to form an input matching circuit. The actual frequency of operation is determined by the combination of the external LC components and the internal components of the RFN. The datasheet provides a table to determine the appropriate LC combination for the desired band/frequency of operation. The configuration shown in the datasheet's typical performance characteristics (TPCs) confirms the 1.575GHz frequency of operation.

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MAX2659 : FAQ